Temperature sensor ICs monitor up to four channels with ±1°C accuracy

March 29, 2016 // By Julien Happich
The MCP990X family of System Management Bus (SMBus) temperature sensor ICs from Microchip can monitor up to four channels in cold, outdoor and industrial low-temperature applications ranging from freezers and refrigerators to base stations and remote radio units.

With ±1°C maximum accuracy for both external and internal diode temperatures from -40°C to +65°C, the ICs include remote diode temperature measurement with resistance error correction that compensates for voltage drops from connectors and long board traces, enabling accurate readings of up to 20 inches away from the IC.

Injected system noise from components such as DC-DC converters and backlight inverters is also minimised with a sample-frequency hopping filter, allowing for easier placement and routing. The combination of these features with options for dual-, triple- and quad-channel temperature monitoring provides for a wider range of measurement opportunities for an entire system with a single IC.

The chips come in an 8-pin, 2x2mm WDFN package for the dual-channel version (MCP9902) and in a 10-pin, 3x3mm DFN package for the MCP9903 triple and MCP9904 quad temperature sensors.

Visit Microchip at www.microchip.com